I did a border run to Cambodia on the 11th and have a 60 day stamp, but I'm almost out of pages so I need to mail it in for renewal. My question is, how soon can I go to Immigration to get the 30 day extension after arriving, and will it have any adverse effect on the passport renewal process? I'm American, so I'm mailing to the American embassy, and have already completed all the forms and requirements, but I'm now considering getting a 30 day extension so as to give me maximum cushion for processing time, but I'm wondering if it could cause a problem either at immigration or in the passport renewal process?
Any advice is greatly appreciated. Thank you.